"this week" with george stephanopoulos. Across south africa, they are praying for nelson mandela. The 94--year-old is being treated for pneumoni abc's ron claiborne. Reporter: Good morning to you, dan. Well, the details of nelson mandela's details of hospitalization has been cloekd in secrecy. We have some confirmation that he's at this private clinic, private hospital behind me in pretoria. When his wife arrived, there are two reports that some of his grandchildren have also arrived at this clinic for a visit. He's been diagnosed with pneumonia and in a government medical bulletin recently, they said his lungs had been tapped. He had fluids around the lung, it was successful. He's able to breathe without difficulty on his own. There is still, though, a lot we don't know about his condition. His prognosis. That recent medical bulletin pointing to some improvement. Dan, he's 94 years old. Declining health. He has knpneumonia. For any 94-year-old would be a cause for concern and it is here in south africa and around the world. People in south africa and all over the world are watching it. Ron, we appreciate it. Thank you, ron. Now, we're going to check in with someone who was missing

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